Louver damper



Patented May 19, 1936 UNITED STATES LOUVER DAMPER Howard J. Young, River Forest, Ill., assgnor to The Powers Regulator Company, Chicago, Il1.,' a corporationv of Illinois Application January z, 1036, serial No. 51,120

Claims.

My invention relates to dampers and particularly to dampers of the type composed of a plurality of parallel pivoted blades.v

It has long been recognized that in the opera- 5 tion of dampers of the type described, itis de sirable to avoid angularity relative to the stream of air being delivered through the damper in partly opened position. This occurs when all the blades are pivoted to swing in the same direcl tion, the result being that the stream of air is deflected laterally and not permitted to travel in a straight line. This is avoided by causing alternate blades to open in opposite directions, but suitable mechanism for 'accompanying this result has not heretofore been suggested.

In that connection it is desirable, in order `to insure a tightly closed damper condition to overlap the edges of adjacent blades. However, where adjacent blades Swingin opposite directions this has been found to be diiiicult if not impossible, due to interference between the overlapped edges at the start of the opening movement.

I have. designed and perfected a mechanism that permits the use of the ideal form of damper blades and to operate the blades in the desired manner without interference.` This is accompanied by utilizing the eccentric motion of two angularly disposed cooperating arms.

The invention will be more readily understood by reference to the accompanying drawing; in which,

Fig. 1 is an elevation of a damper constructed in accordance with my invention;

Fig. 2 is a sectional view on the line 2-2 of l Fig. 1; and,

Fig. 3 is a similar view with the blades in open position.

In the drawing I have illustrated a. small model having only four blades. It will be understood, however, that the invention may be applied to a damper of any desired size or number of blades. In the drawing, the damper is illustrated as consisting of an angular frame I0, having side stop anges II. Each of the four blades I2, I3, I4, I5 carries a, pintle I6 at each end, seated in suitable openings in the frame III and acting as pivots arranged 'at the central longitudinal axis of the blades. It will be noted that by reason of the arms I1, I8 and the link I9, the blades I2, I4 are caused i to swing with the same' motion, that is, in the same direction; further, that as the result of the arms 20, 2| and the link 22, the blades I3, I5

noted also that the edges or margins of the blades overlap as shown in Fig. 2. Withthis arrangement adjacent blades could not swing toward open position without coniiict at their margins, but this is avoided by the means about to be de- 5 scribed.

The actuating member or link 23, shown in dotted lines in Figs. 2 and 3, is connected to an ear 24 mounted at one side of the pivot point of the blade I4, this link being actuated by a 10 motor of some kind in the usual manner. It will be seen that a thrust on the link 23 will tend to swing the blade I4 into the position shown inl Fig.

3. Connected to the blade I4 ata point adjacent to the ear 24 is an arm 25 carrying a pin or bolt 15 26 at the outer end thereof. A similar arm 21 is connected to the blade I3, in this instance -the connection being to the pivot or pintle I6 which is rigid with lthe blade through the set bolt28. The arm might be connected to the blade in other 20 manners than that shown. It will be noted that the arms 25,21 are arranged at converging angles, the arm 21 having a slot 29 cooperating with the pin 26 in the end ofthe arm 25. Due to the angularity of the arms, the early part of the an- 25 gular movement of the blade I4 from the position of Fig. 2 toward that of Fig. 3 results in very slight angular movement of the blade I3, the movement increasing however, as the opening movement continues. This is because the 30 pin 26 is traveling almost exactly lengthwise of the slot 29. This permits the overlapped edges of the blades to separate and thereby avoid interference, the movement of the blade I3 accelerating as the action continues. On the closing mo- 35 tion the described action is reversed, the blade I3 being practically closed somewhat ahead of the bladeA I4. -It will be noted that the described movement of the blades I3, I4 is duplicated in all the other blades making up the damper, due to 40 the cross connection by means of the links. As

a result the desired damper opening is provided and a complete and tight closing of the blades is insured, due to the overlapping.

As above stated, the device shown in the draw- 45 ing is illustrative of the principle, and changes and modifications therein will readily suggest themselves to others to meet required conditions.

I claim:

1. In a louver damper, the combination of 50 pivted blades, adjacent blades being mounted to swing in opposite directions, links connecting alternate blades whereby to eiect duplication of motion thereof, an actuating arm connected to one blade for eiecting movement thereof, an

arm projecting at an angle from the plane of the i'ace of the actuated blade, a .second arm projecting at an angle from the face of an adjacent blade, said arms having apin and slot connection whereby theA movement o1' the actuated blade is transmitted eccentrically 'to said adjacent blade.

2. In a damper, the combination of a plurality of parallel `pivoted blades, adjacent blades having their edges overlapped when in closed position and adjacent blades being mounted to swing in opposite directions, links connecting alternate blades whereby to eiect duplication of motion thereof, a member connected to one blade for actuating the same, an arm projecting atr an angle from the plane oi the nrst of the actuated blades, a second arm projecting at an angle from the face of an adjacent blade, said arms having "f whereby to effect duplication oi' motion thereof, a

member connected to` one blade for actuating the same. a pair oi' arms one connected to each o! two adjacent blades, 'said arms projecting toward each other and forming a V with the blades in closed position, a pin in the end of one arm cooperating with a slot` in the other arm -whereby the blade thatrcarries the arm with the pin mayswing more 'rapidly toward an open position at the. beginning of the opening movement than the bladecarrying' the slotted arm whereby the overlapped edges arenoninteriering.

4. In a damper, a combination of a plurality 4of parallel blades pivoted on their central longitudinal axis adjacent blades being mounted to swing in opposite directions, means connecting alternate blades whereby to eiiect motion in the same direction, adriven thrust armV connected to one blade at one side oi' its pivot for swinging Said blade, an arm ilxed to saidactuated blade and projecting at an angle therefrom, a cooperating arm projected from an adjacent blade and. arranged to converge into cooperating relation with said 'iirst arm. one of said arms baving'a in and the other a slot whereby the so connec blades are caused to swing in opposite directions, the eccentricity of movement'oi said arms causing accelerated' motion ot one blade at the beginning of the opening movement of said blades. 1

5. In a louver damper, the combination of. pivoted blades, adjacent blades being mounted to swing in opposite directions, an actuating arm connected to oneblade for eilfecting movement thereof, an arm projecting at an angleV from the plane of the face of the actuated blade. a second arm projecting 'at an angle from the face oi an adjacent blade, said arms having a pin and' slot connection whereby the movement of the actuated blade is transmitted eccentricaliy to said adjacent blade. f

' HOWARD J. YOUNG. 

